Shell snippetsshell snippets
Here you will find Bash, Perl, PHP and other useful code snippets.
Sendmail
m4 /usr/share/sendmail-cf/m4/cf.m4 sendmail.mc > sendmail.cf
m4 /usr/share/sendmail-cf/m4/cf.m4 submit.mc > submit.cf
Mount ISO image
mount -o loop image.iso /mnt/mountpoint
Create ISO image with dd from DVD or CD
dd if=/dev/dvd of=/tmp/image.iso
Create ISO image from a directory
mkisofs -o /tmp/image.iso /tmp/directory/
Compare iso image with original DVD or CD
cmp /dev/dvd /tmp/image.iso
Unpack rpm file
rpm2cpio < package.rpm > temp.cpio
cpio --make-directories -F temp.cpio -i
rm -f temp.cpio
Get sizes of a Veritas VM managed diskgroup
vxassist -g [diskgroup] maxgrow [volume]
vxassist -g [diskgoup] maxsize
vxdisk list #list all disks
vxprint -hrt #get disk and volume information
vxprint -l #get extendet disk and volume information
Get the whole size of all disks
vxprint -ht | grep cx700 | grep dm | awk 'BEGIN {s=0} {s=s+$6} END {print s/2097152, "GB"}'
Get the used size
vxprint -ht | grep cx700 | grep sd | awk 'BEGIN {s=0} {s=s+$6} END {print s/2097152, "GB"}'
If you grep for a device like c2t2d2 you will get the result only for this device not for the whole LUN
Execute a code on many machines
open a file and edit.
#!/bin/bash
hostlist="host1 host2 host3 host4 host5 host6";
for i in $hostlist do
ssh -l root $i "tail -10 /var/log/messages" >> $i.log
done
MySQL dump
mysqldump -u username --password=secret --opt database > backup.sql
Pack with tar and GZip
tar czf backup.tar.gz /var/log
Find and delete 7 days old core and dead.letter files
find / -xdev -type f '(' -name core -o -name dead.letter ')' -atime +7 -mtime +7 -exec rm -i '{}' ';'
Check for open Ports on remote machines
nmap -sT -O hostname
nmap -sT -O -p 23 hostname #check only for telnet port 23